As people grow older, it is normal for the body to change in many ways. Muscles may become weaker, bones may lose strength, and the lungs may not work as well as they once did.
However, new research suggests that obesity may add an extra burden on lung health in older adults, beyond what would be expected from aging alone.
In a recent study presented at the 2026 American Physiology Summit in Minneapolis, scientists found that older adults with obesity had noticeably poorer lung function compared to those without obesity. The findings highlight an important issue, especially for older people who often experience shortness of breath and may not know the cause.
The study was carried out by researchers from the Institute for Exercise and Environmental Medicine at Texas Health Presbyterian Hospital and UT Southwestern Medical Center. The research focused on understanding how body fat and where it is stored in the body may affect breathing ability in later life.
Obesity is common among older adults. According to estimates from the Centers for Disease Control and Prevention, around 30 percent of adults aged 65 and older in the United States live with obesity. This condition is already known to increase the risk of heart disease, diabetes, and other health problems. Now, this study adds another concern: reduced lung function.
To explore this, the researchers studied 59 older adults, with an average age of about 70 years. Just under half of the participants had obesity. The team measured both body composition and lung function to see how they were related.
They found that participants with obesity had higher levels of body fat overall. They also had more fat around the trunk and deeper inside the abdomen, known as visceral fat. This type of fat surrounds internal organs and is considered more harmful to health.
When the researchers tested lung function, they found clear differences. People with obesity had lower total lung capacity, meaning their lungs could hold less air after a deep breath. They also had reduced ability to push air out of the lungs, both in terms of volume and speed.
These measures are important because they reflect how well the lungs can move air in and out. When lung function is reduced, it can make physical activities more difficult and lead to symptoms such as shortness of breath and fatigue.
The researchers noted that these effects may explain why some older adults with obesity struggle with exercise or feel breathless even during simple tasks. It suggests that excess body fat may physically limit how the lungs expand and function.
Interestingly, the study also looked at differences between men and women. While women tended to have a higher percentage of body fat overall, and men had more fat around the abdomen, these differences did not lead to meaningful differences in lung function. This means the negative effect of obesity on breathing appears to be similar in both sexes.
The lead researcher, Sarah Skillett, explained that these findings are important for doctors and healthcare providers. When older adults report breathing problems, clinicians should consider obesity as a possible contributing factor, not just age or other diseases.
However, it is important to understand the limits of the study. The number of participants was relatively small, and the results were presented as a conference abstract rather than a full published paper. This means more research is needed to confirm the findings in larger groups of people.
Despite these limitations, the study provides useful insight into how obesity may affect the body in later life. It highlights the importance of maintaining a healthy weight and staying physically active, even in older age.
In conclusion, this research suggests that obesity can reduce lung function in older adults, making breathing more difficult and limiting physical ability. While aging naturally affects the lungs, excess body fat may worsen this decline.
From a critical perspective, the study offers valuable early evidence but needs further confirmation through larger and longer studies. Still, it raises awareness of an often-overlooked issue and supports the need for more personalized care for older adults with obesity.
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Source: UT Southwestern Medical Center.
